Compatibility with IE 7

I have activated this feature in my SharePoint 2010 site. Doing so applied the custom master page and made the site completely unusable. When I say “unusable”, it stopped the site’s menus and navigation links from being displayed and my
site looked nothing like the screen shots. For example, when I clicked Site Actions, the menu didn’t drop down far enough for me to select Site Settings. Even if I changed my URL to .../_layouts/ManageFeatures.aspx?Scope=Site, the page didn’t show
any content so I was unable to access the feature to deactivate it.

Opening the site in Chrome works as expected. Are there issues with this feature and IE7?